Collect Earth Online (CEO) has many resources if you want to learn how to use the tool, please see these resources below:

We have collaborated with FAO on the development of tools and modules comprising the OpenForis  suite of free and open source tools. The two co-developed tools include Collect Earth Online, an image  attribution platform, and SEPAL, a geospatial cloud computing platform. Collect Earth Online is a system  for viewing and interpreting high-resolution satellite imagery. It enables users to efficiently collect up-to-date information about their environment and observe changes over time. Organizations around the world  use CEO to detect deforestation, forest degradation, and other changes in the landscape.